What does Superuser.com look like? Beyond the questions, the answers, the votes, the comments, the edits, are there clear patterns of community activity? Do trends emerge? Are social norms evident? Is visualising this sort of information useful? Can visualisation support existing community processes? These are the sorts of questions we pursued with Explore.SU – a visualisation environment developed on the Superuser.com public API. In this blog post, we will take a look at the development of Explore.SU, briefly explore how online communities have been visualised to date and examine the rationale for our design decisions. We also discuss findings from a small study and draw some initial conclusions based on our experiences.